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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5ab891f21dc63de6b5f168d97f89a41d2f784c5faa7bdc49b6a9a1be6cd753' 
  AND token = 'oLA25ONmTgN7gmf9jI22D8hg2+w9/ybUvms+WA7JEX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}